<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>注册</h1>
<form action="">
    <input type="text" name="username" placeholder="用户名" @blur="check()">{{info}}<br>
    <input type="password" name="password" placeholder="密码">{{info}}<br>
    <input type="text" name="nick" placeholder="昵称">{{info}}<br>
    <input type="button" value="注册" @click="reg()">
</form>
<!--引入vue和axios-->
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script>
    let v = new Vue({
        el:"form",
        data:{
            info:""
        },
        methods:{
            check:function () {
                let data = new FormData(document.querySelector("form"));
                axios.post("/check",data).then(function (response) {
                    v.info = response.data==1?"用户名可用!":"用户名已存在!"
                })
            },
            reg:function () {
                let data = new FormData(document.querySelector("form"));
                axios.post("/reg",data).then(function (response) {
                    if (response.data==1){
                        alert("注册成功!");
                        location.href="/";//回到首页
                    }else{
                        alert("用户名已存在!");
                    }
                })

            }
        }
    })
</script>
</body>
</html>